# Change Log
## [4.3.0](https://github.com/sunng87/handlebars-rust/compare/4.2.2...4.3.0) - 2022-05-18
* [Changed] update MSRV to 1.57 as rhai requires
* [Fixed] Reimplemented indent support for partial expression `{{>
partial}}`, which is introduced in 4.2.0. The new implementation is
aligned with original javascript version, that every text line
generated from partial are indented as `{{> partial}}`
does. `prevent_indent` will turn-off this feature. [#505]
* [Changed] changed error support library from quick_error to
thiserror
## [4.2.2](https://github.com/sunng87/handlebars-rust/compare/4.2.1...4.2.2) - 2022-03-09
* [Fixed] Block param scope leaked into partials [#496]
* [Changed] Use Rust 2021 edition and update MSRV to 1.56
## [4.2.1](https://github.com/sunng87/handlebars-rust/compare/4.2.0...4.2.1) - 2022-01-17
* [Fixed] Nested partial `@partial-block` referencing issue [#488]
* [Fixed] Docs generation on docs.rs for `rust-embed` feature
## [4.2.0](https://github.com/sunng87/handlebars-rust/compare/4.1.6...4.2.0) - 2022-01-05
* [Added] RustEmbed support for loading templates from [#484]
* [Fixed] Parser support for variables begins with digit [#479]
* [Changed] Keep indent whitespaces for partial expression `{{>
partial}}` as default in handlebarsjs. A new option `prevent_indent`
is provided on `Handlebars` to turn off this behaviour. [#486]
* [Changed] Update MSRV to 1.51 due to dependency changes
## [4.1.6](https://github.com/sunng87/handlebars-rust/compare/4.1.5...4.1.6) - 2021-12-03
* [Added] Create `Context` from owned `serde_json::Value` [#477]
## [4.1.5](https://github.com/sunng87/handlebars-rust/compare/4.1.4...4.1.5) - 2021-11-17
* [Fixed] Single-quote string literal is supported, again [#475]
## [4.1.4](https://github.com/sunng87/handlebars-rust/compare/4.1.3...4.1.4) - 2021-11-06
* [Fixed] Corrected empty line stripping strategy [#473]
## [4.1.3](https://github.com/sunng87/handlebars-rust/compare/4.1.2...4.1.3) - 2021-09-10
* [Added] `@last` variable for `each` block with object [#466]
* [Fixed] Missing whitespaces behind expression [#468]
## [4.1.2](https://github.com/sunng87/handlebars-rust/compare/4.1.1...4.1.2) - 2021-08-11
* [Added] Support for generic types in `handlebars_helper!`.
* [Added] Getter and setter for rhai `Engine` from registry.
* [Fixed] Improve doc for `dev_mode` that it has to be enabled before
adding templates.
## [4.1.1](https://github.com/sunng87/handlebars-rust/compare/4.1.0...4.1.1) - 2021-07-31
* [Changed] Update rhai to 1.0 [#455]
* [Fixed] Empty line stripping for partial include statement, and other corner cases [#458]
## [4.1.0](https://github.com/sunng87/handlebars-rust/compare/4.0.1...4.1.0) - 2021-07-05
* [Added] export `StringOutput` as requested in #442
* [Changed] strict mode now applies to our helper macro `handlebars_helper!` and
built-in helpers based on it.
* [Fixed] Line stripping feature for standalone statment introduced in #404 is now
aligned with handlebarsjs. #448
## [4.0.1](https://github.com/sunng87/handlebars-rust/compare/4.0.0...4.0.1) - 2021-06-15
* [Fixed] Each block render error with empty array or object [#445]
## [4.0.0](https://github.com/sunng87/handlebars-rust/compare/3.4.0...4.0.0) - 2021-05-25
* [Added] `dev_mode` for registry: templates and scripts loaded from file are always
reloaded when dev mode enabled [#395]
* [Added] Registry is now `Clone` [#395]
* [Added] New built-in helper `len` [#421]
* [Changed] Updated `rhai` to 0.19 and then 0.20 [#391]
* [Changed] `#each` helper now renders else block for non-iterable data [#380]
* [Changed] `TemplateError` and `ScriptError` is now a cause of `RenderError` [#395]
* [Changed] Empty lines around block helpers are now stripped [#404]
* [Changed] **Breaking** `RenderContext::get_partial` now returns `Option<&Template>`
* [Changed] **Breaking** Capitalize names like `HtmlExpression` and `IoError` based on clippy recommendations [#424]
* [Changed] **Breaking** Improved return type of `call_inner` from `HelperDef` to avoid misleading [#437]
* [Fixed] reference starts with `null`, `true` and `false` were parsed incorrectly [#382]
* [Fixed] dir source path separator bug on windows [#389] [#405]
* [Fixed] stack overflow with nested `@partial-block` [#401]
* [Fixed] value access issue when upper block has a base value [#419]
* [Fixed] escape rules for Json string literal [#423]
* [Fixed] **Breaking** zero-arity subexpressions support [#433]
Zero-arity subexpression no longer resolved as variable. The behaviour is now aligned with handlebarsjs.
For instance, `{{(parent)}}` can no longer access `parent` field of the context object, use
`{{lookup this "parent"}}` instead. This change applies to partial inclusion, too.
* [Removed] **Breaking** option to disable source map is removed [#395]
* [Removed] **Breaking** `TemplateFileError` and `TemplateRenderError` are removed and merged into
`TemplateError` and `RenderError` [#395]
## [3.5.5](https://github.com/sunng87/handlebars-rust/compare/3.5.4...3.5.5) - 2021-05-03
* [Fixed] Panic on reporting invalid tag name [#427]
## [3.5.4](https://github.com/sunng87/handlebars-rust/compare/3.5.3...3.5.4) - 2021-03-27
* [Fixed] Json string literal with escape char [#422]
## [3.5.3](https://github.com/sunng87/handlebars-rust/compare/3.5.2...3.5.3) - 2021-02-20
* [Fixed] value access issue when upper block has a base value [#419]
## [3.5.2](https://github.com/sunng87/handlebars-rust/compare/3.5.1...3.5.2) - 2020-12-29
* [Fixed] allow `/` as trailing separator on Windows, backported from master [#405]
## [3.5.1](https://github.com/sunng87/handlebars-rust/compare/3.5.0...3.5.1) - 2020-10-25
* [Fixed] dir source path separator bug on windows [#389]
## [3.5.0](https://github.com/sunng87/handlebars-rust/compare/3.4.0...3.5.0) - 2020-09-23
* [Changed] `#each` helper now renders else block for non-iterable data [#380]
* [Fixed] reference starts with `null`, `true` and `false` were parsed incorrectly [#382]
## [3.4.0](https://github.com/sunng87/handlebars-rust/compare/3.3.0...3.4.0) - 2020-08-14
* [Added] Debug log that can be turned on by using envlog or other implementation, to trace data resolution during rendering [#369]
* [Fixed] Derived value as block context base value [#343, #353]
* [Fixed] Partial name aligned with handlebars.js, added support for `.`, escape `[]` and string `''` name
* [Changed] HTML escape aligned with handlebars.js, added `=`, `\` and ``` [#366]
* [Changed] Update rhai to 0.18 [#370]
* [Fixed] Result of simple helper is now escaped [#373]
## [3.3.0](https://github.com/sunng87/handlebars-rust/compare/3.2.1...3.3.0) - 2020-07-18
* [Added] Added two new APIs to reuse `Context` for rendering [#352]
* [Changed] Update rhai to 0.17 [#354]
* [Fixed] Fixed mustache.js html expression support, which is "&" instead of "$"
## [3.2.1](https://github.com/sunng87/handlebars-rust/compare/3.2.0...3.2.1) - 2020-06-28
* [Fixed] block context leak introduced in 3.2.0, #346 [#349]
## [3.2.0](https://github.com/sunng87/handlebars-rust/compare/3.1.0...3.2.0) - 2020-06-28
* [Added] API to register an pre-processed template [#331]
* [Added] Helper macro now has support for named argument and helepr hash [#338]
* [Added] Added support for `$` expression that is part of mustache.js [#339]
* [Changed] Update rhai to 0.15 [#330]
* [Fixed] else block for `each` [#344]
## [3.1.0](https://github.com/sunng87/handlebars-rust/compare/3.0.1...3.1.0) - 2020-06-01
* [Added] All new rhai script helper
* [Added] multiple parameter support for log helper
* [Fixed] helper lookup priority
* [Changed] `Send` and `Sync` are not required for RenderContext local helper [#319]
* [Fixed] partial block when using path as name [#321]
## [3.0.1](https://github.com/sunng87/handlebars-rust/compare/3.0.0...3.0.1) - 2020-01-25
* [Fixed] Slash in partial path causing syntax error #313
## [3.0.0](https://github.com/sunng87/handlebars-rust/compare/2.0.3...3.0.0) - 2020-01-24
* [Changed] Added lifetime specifier to `Handlebars` structure allowing helper definition to have non-static borrowed data #282
* [Changed] Removed hashbrown dependency #279
* [Changed] Features has been reorganized. `dir_source` were turned off by default. #289
* [Changed] Refactored `RenderContext` API to improve performance up to 5x over `2.0`
* [Added] Add new `BlockContext` API for helper developer to store block scope state #307
* [Fixed] `RenderError` should be `Send` and `Sync` #304
## [2.0.4](https://github.com/sunng87/handlebars-rust/compare/2.0.3...2.0.4) - 2020-01-06
* [Fixed] `RenderError` should be `Send` and `Sync` #304
## [2.0.3](https://github.com/sunng87/handlebars-rust/compare/2.0.2...2.0.3) - 2020-01-04
* [Fixed] deprecated warnings on rust 1.42 nightly, due to changes in
`Error` trait
## [2.0.2](https://github.com/sunng87/handlebars-rust/compare/2.0.1...2.0.2) - 2019-09-06
* [Changed] Extended `eq` and `ne` helper for all json types #287
* [Changed] Removed `regex` and `lazy_static` crate to optimize dependency tree
## [2.0.1](https://github.com/sunng87/handlebars-rust/compare/2.0.0...2.0.1) - 2019-07-12
* [Changed] Fixed issue with block context #275
* [Changed] Added support for array index in block context #276
* [Changed] Deprecated RenderContext `concat_path`
* [Changed] Update hashbrown to 0.5.0
## [2.0.0](https://github.com/sunng87/handlebars-rust/compare/2.0.0-beta3...2.0.0) - 2019-07-02
* [Changed] Fixed more dyn trait warnings
* [Changed] #80 Fixed support for zero-param helper
* [Changed] Changed minimum Rust version to 1.32 as required by
getrandom crate
## [2.0.0-beta.3](https://github.com/sunng87/handlebars-rust/compare/2.0.0-beta1...2.0.0-beta.3) - 2019-06-24
* [Changed] Block parameter revamp, fixed cases for #260 and #264
* [Changed] #265 Fixed block parameter order in `each` helper
* [Changed] #266 Accept any JSON value in boolean helpers
* [Changed] `RenderContext` API update, `evaluate_absolute` removed,
use `@root` instead
## [2.0.0-beta.1](https://github.com/sunng87/handlebars-rust/compare/1.1.0...2.0.0-beta.1) - 2019-03-16
* [Changed] Everything changed in yanked 1.2.0
* [Changed] With Pest updated to 2.1, our minimal rust version is set
to 1.31
* [Changed] Using hashbrown `HashMap` internally and externally,
performance improvement up to 10%
* [Changed] strict mode also apply to return value of helper expression
## [1.2.0](https://github.com/sunng87/handlebars-rust/compare/1.1.0...1.2.0) - 2018-12-15
*This release is yanked.*
* [Changed] Using rust 2018 edition
* [Changed] Improve strict mode and only raise error when accessing
missing fields in expression
* [Changed] Improved `get_helper` and `get_decorator` return type
## [1.1.0](https://github.com/sunng87/handlebars-rust/compare/1.0.5...1.1.0) - 2018-10-24
* [Added] New option `includeZero` for `if` helper
* [Added] New option `level` for `log` helper
* [Changed] Updated Pest to 2.0, moving minimal Rust version to 1.30
## [1.0.5](https://github.com/sunng87/handlebars-rust/compare/1.0.4...1.0.5) - 2018-10-04
* [Changed] Added feature `no_logging` for using handlebars in a
logging provider.
## [1.0.4](https://github.com/sunng87/handlebars-rust/compare/1.0.3...1.0.4) - 2018-09-21
* [Changed] Fixed build on wasm
* [Changed] Added support for single-quote Json string literal
## [1.0.3](https://github.com/sunng87/handlebars-rust/compare/1.0.2...1.0.3) - 2018-08-29
* [Changed] Fixed build on Rust 1.23.0
## [1.0.2](https://github.com/sunng87/handlebars-rust/compare/1.0.1...1.0.2) - 2018-08-27
* [Changed] Update minimal dependency versions
## [1.0.1](https://github.com/sunng87/handlebars-rust/compare/1.0.0...1.0.1) - 2018-08-16
* [Changed] Added hidden/temp file filter to directory register
## [1.0.0](https://github.com/sunng87/handlebars-rust/compare/0.32.4...1.0.0) - 2018-07-18
* [Changed] Helper API finalized and new output API
* [Changed] New internal value API, reduced clone cost
* [Added] Helper macro
* [Added] New built-in helpers: `gt`, `lt` and some more
* [Added] Register template folder
## [0.32.4](https://github.com/sunng87/handlebars-rust/compare/0.32.3...0.32.4) - 2018-05-23
* [Changed] Keep compatibility with pre-1.26 rust by removing `impl
Trait` on parameters
## [0.32.3](https://github.com/sunng87/handlebars-rust/compare/0.32.2...0.32.3) - 2018-05-21
* [Changed] Fixed escape syntax
## [0.32.2](https://github.com/sunng87/handlebars-rust/compare/0.32.1...0.32.2) - 2018-05-09
* [Changed] Fixed issue with processing handlebars comment
## [0.32.1](https://github.com/sunng87/handlebars-rust/compare/0.32.0...0.32.1) - 2018-05-02
* [Changed] Regex 1.0
## [0.32.0](https://github.com/sunng87/handlebars-rust/compare/0.30.1...0.32.0) - 2018-02-16
* [Added] Strict mode that raises `RenderError` on accessing
non-existed field or array index.
## [0.31.0](https://github.com/sunng87/handlebars-rust/compare/0.30.1...0.31.0) - 2018-02-09
* [Changed] Fixed handlebars comment support, added html comment output
* [Changed] Removed some wasted string clones
## [0.30.1](https://github.com/sunng87/handlebars-rust/compare/0.30.0...0.30.1) - 2018-01-31
* [Changed] Added `Debug` for public types
## [0.30.0](https://github.com/sunng87/handlebars-rust/compare/0.30.0-beta.5...0.30.0) - 2018-01-21
* [Changed] Use pest 1.0
## [0.30.0-beta.5](https://github.com/sunng87/handlebars-rust/compare/0.30.0-beta.4...0.30.0-beta.5) - 2018-01-19
* [Changed] Improve `TemplateError` display. Now includes a segment of
template string.
* [Changed] Updated `lazy_static` to 1.0
* [Changed] Renamed some render functions names.
## [0.30.0-beta.4](https://github.com/sunng87/handlebars-rust/compare/0.30.0-beta.3...0.30.0-beta.4) - 2017-11-20
* [Changed] Added `Sync` to the nested error of `RenderError`
## [0.30.0-beta.3](https://github.com/sunng87/handlebars-rust/compare/0.30.0-beta.2...0.30.0-beta.3) - 2017-11-16
* [Changed] Fixed issue `template_render` methods doesn't respect `source_map` setting
## [0.30.0-beta.2](https://github.com/sunng87/handlebars-rust/compare/0.30.0-beta.1...0.30.0-beta.2) - 2017-10-07
* [Changed] Fixed parsing keywords like `as`
## [0.30.0-beta.1](https://github.com/sunng87/handlebars-rust/compare/0.29.1...0.30.0-beta.1) - 2017-10-03
* [Changed] Upgrade pest to 1.0
* [Changed] Fixed template parsing issue when parameter starts with "as"
* [Changed] Added new HelperDef function to return JSON value
* [Changed] Added support for @root
## [0.29.1](https://github.com/sunng87/handlebars-rust/compare/0.29.0...0.29.1) - 2017-09-01
* [Changed] Remove `debug!` logging from render to avoid conflict when
using handlebars as logging backend
## [0.29.0](https://github.com/sunng87/handlebars-rust/compare/0.28.3...0.29.0) - 2017-08-23
* [Changed] Align JSON path with original JavaScript implementation
## [0.28.3](https://github.com/sunng87/handlebars-rust/compare/0.28.2...0.28.3) - 2017-08-02
* [Changed] fixed support for escape, again
## [0.28.2](https://github.com/sunng87/handlebars-rust/compare/0.28.1...0.28.2) - 2017-08-01
* [Changed] Fixed support for escape `\\{{`. [#170](https://github.com/sunng87/handlebars-rust/issues/170)
## [0.28.1](https://github.com/sunng87/handlebars-rust/compare/0.28.0...0.28.1) - 2017-07-16
* [Changed] Mark `RenderError` with `Send` trait
## [0.28.0](https://github.com/sunng87/handlebars-rust/compare/0.27.0...0.28.0) - 2017-07-15
* [Changed] Fixed performance issue discussed in [#166](https://github.com/sunng87/handlebars-rust/issues/166)
* [Added] Added error cause `RenderError`
## [0.27.0](https://github.com/sunng87/handlebars-rust/compare/0.26.2...0.27.0) - 2017-06-03
* [Changed] `partial_legacy` is dropped
* [Changed] `context.navigate` now returns a `Result<&Json,RenderError>`. Error is raised when
given path cannot be not parsed.
* [Changed] removed `context::extend` because it's like to ruin your context outside the helper.
* [Changed] `RenderContext` now owns `Context`, you can host a new Context for particular block
helper.
* [Changed] Added some convenience functions to `RenderContext`. However, `RenderContext` may
still change in future release.
## [0.26.1](https://github.com/sunng87/handlebars-rust/compare/0.25.3...0.26.1) - 2017-04-23
* [Changed] Updated to Serde 1.0
* [Changed] Dropped rustc_serialize, serde is now the default type system
## [0.25.3](https://github.com/sunng87/handlebars-rust/compare/0.25.2...0.25.3) - 2017-04-19
* [Changed] Fixed path up [#147](https://github.com/sunng87/handlebars-rust/issues/147)
* [Changed] Fixed duplicated template inclusion [#146](https://github.com/sunng87/handlebars-rust/issues/146)
## [0.25.2](https://github.com/sunng87/handlebars-rust/compare/0.25.1...0.25.2) - 2017-03-22
* [Changed] Fixed bug when including two partials with same name [#143](https://github.com/sunng87/handlebars-rust/issues/143)
## [0.25.1](https://github.com/sunng87/handlebars-rust/compare/0.25.0...0.25.1) - 2017-02-21
* [Added] Added support for braces escaping`\{{var}}`.
## [0.25.0](https://github.com/sunng87/handlebars-rust/compare/0.24.2...0.25.0) - 2017-01-28
* [Changed] Updated serde family to 0.9.x
* [Added] Added `to_json` function to convert data to `Json` or `Value`
## [0.24.2](https://github.com/sunng87/handlebars-rust/compare/0.24.1...0.24.2) - 2017-01-28
* [Added] Added support for `{{> @partial-block}}`
## [0.24.1](https://github.com/sunng87/handlebars-rust/compare/0.24.0...0.24.1) - 2016-12-30
* [Changed] Updated `regex` crate to 0.2, fixed WebAssembly support
* [Changed] Fixed error reporting in partial.
## [0.24.0](https://github.com/sunng87/handlebars-rust/compare/0.23.0...0.24.0) - 2016-12-30
* [Added] Decorator support: change context data and helpers during rendering
* [Changed] (**Breaking**) Helper trait changed, `Context` parameter no longer
available, use `render_context.context()` instead.
* [Changed] (**Breaking**) Refactored Handlebars APIs, `Template` and
`Context` are no longer exposed in public API.
* [Changed] Docs updated.
## [0.23.0](https://github.com/sunng87/handlebars-rust/compare/0.22.0...0.23.0) - 2016-12-12
* [Changed] `partial4` is now default. Use `partial_legacy` for previous version of template inheritance.
* [Changed] Corrected subexpression behavior. Subexpression result is treated as string.
* [Changed] Improved performance for render: better escape function and string writer buffer.
## [0.22.0](https://github.com/sunng87/handlebars-rust/compare/0.21.1...0.22.0) - 2016-10-29
* [Changed] Improved error reporting. Fixed display for several error
types.
* [Changed] Dropped regex and lazystatic as dependency.
* [Changed] Examples refined.
## [0.21.1](https://github.com/sunng87/handlebars-rust/compare/0.21.0...0.21.1) - 2016-10-09
* [Changed] Fixed
[#106](https://github.com/sunng87/handlebars-rust/issue/106), when
property name contains `this`, it doesn't work
## [0.21.0](https://github.com/sunng87/handlebars-rust/compare/0.20.5...0.21.0) - 2016-09-27
* [Added] Block params support
[#101](https://github.com/sunng87/handlebars-rust/pull/101)
* [Added] New partial syntax [#103](https://github.com/sunng87/handlebars-rust/pull/103)
* [Changed] Rewrite path parser, better support for `../`
[#105](https://github.com/sunng87/handlebars-rust/pull/105)
## [0.20.5](https://github.com/sunng87/handlebars-rust/compare/0.20.5...0.20.4) - 2016-08-27
* [Changed] Fixed issue for using [] in expression
[#100](https://github.com/sunng87/handlebars-rust/issue/100)
## [0.20.4](https://github.com/sunng87/handlebars-rust/compare/0.20.4...0.20.3) - 2016-08-27
* [Changed] Fixed error message for partials
[#98](https://github.com/sunng87/handlebars-rust/issue/98)
* [Added] Added support for `else` in `each` block
[#99](https://github.com/sunng87/handlebars-rust/issue/99)
## [0.20.3](https://github.com/sunng87/handlebars-rust/compare/0.20.3...0.20.2) - 2016-08-14
* [Changed] Fixed `with` used inside `each` block [#97](https://github.com/sunng87/handlebars-rust/pull/97)
## [0.20.2](https://github.com/sunng87/handlebars-rust/compare/0.20.2...0.20.0) - 2016-08-07
* [Changed] Allowed dash character in reference
[#94](https://github.com/sunng87/handlebars-rust/pull/94)
* [Changed] Fixed path error in nested each helpers [#95](https://github.com/sunng87/handlebars-rust/pull/95)
## [0.20.0](https://github.com/sunng87/handlebars-rust/compare/0.20.0...0.19.1) - 2016-07-31
* [Changed] Updated serde to 0.8
## [0.19.1](https://github.com/sunng87/handlebars-rust/compare/0.19.1...0.19.0) - 2016-07-26
* [Changed] Fixed `../` path visitor bug in nested `#each`
[#93](https://github.com/sunng87/handlebars-rust/issues/93)
* [Changed] Rollback 0.19.0 change for `#if`
## [0.19.0] - 2016-07-24
* [Changed] changed `&Path` to `AsRef<Path>`
* [Changed] Fixed "../" path visitor in `#each` and `#if`.
* [Added] `set_local_path_root` and `get_local_path_root` for
`RenderContext`.
## [0.18.2] - 2016-07-11
* [Changed] Disable `rustc_type` when `serde_type` enabled.
## [0.18.1] - 2016-07-04
* [Changed] Allow `-` char in reference.
## [0.18.0] - 2016-06-25
* [Changed] Rewrite template parser with pest.
## [0.17.0] - 2016-06-05
* [Added] JSON literals as helper param or hash, and subexpression
return value.
* [Added] RenderError now reports template name, line and column
number. Enabled by default. This behavior can be disabled via
`registry.source_map_enable(false)` on production.
* [Changed] Helper API **break change**: `param(..)` and `hash(...)`
now returns a `ContextJson` as value which contains path as well as
parsed Json value. No need to call `ctx.navigate(...)` any more.
* [Removed] `to_string` of `Template` and `TemplateElement` which is
unnecessary and contains issue
## [0.16.1] - 2016-05-15
* [Removed] `num` crate dependency which is unnecessary
## [0.16.0] - 2016-03-18
* [Added] new APIs to render template string/files without
registering to Registry
* [Added] new handlebars raw helper syntax
## [0.15.0] - 2016-03-01
* [Changed] update serde libraries to 0.7.x
## [0.14.0] - 2016-02-08
* [Added] new API: `register_template_file`